Centrifugal pump.



D. L. DODGE & T. F. ARMSTRONG.

' GENTRIFUGAL PUMP.

APPLICATION FILED 001. 19, 1913.

Patented D9016, 1913.

2 annua -sum 1.

INVENTEJRS:

WITNESSES: 43 A j A M 7 mm; ATTEJRNEY D. L. DODGE F. ARMSTRONG.

CENTRIFUGAL PUMP.

APPLICATION FILED 00T.19, 1912.

' Patented Dec.- 16, 1913.

2 SHEETS-SHEET 2.

UNITED W S; regular ornicn.

DANIEL L. DODGE, OF INWOOD, AND THOMAS F. ARMSTRONG, O33 FAR ROCKAW'AY, NEW YORK.

oENrnIrUGAL P'UMP.

Specification of Letters Patent.

Patented Dec. 1 (S. 15113.

Application filed October 19, 1912. Serial No. 726,645.

To all whom it may concern:

Be it known that we, DANIEL L. Bones and T nouns F. Anns'rnoizo, citizens of the United States, and residents, respectively, of Inwood, in the county of Nassau and State of New York, and of Far liockaway, in the county of Queens, in said State, have jointly invented a certain ne Y and useful Improvement in Centrifugal Pumps, of which the following is a full, clear, and exact description, reference being made to the accompanying drawings, forming part of this specification.

This invention relates especially to unprovements in apparatus which comprises av centrifugal pump and a system of pipes, and with which a. fluid mixture composed of sand or other earth and water is conveyed to and deposited in hollows, marshes and other places where filling is required to make new ground,

The object of the invention is to increase the efiiciency of such apparatus so as to enable work to be done with power that is commonly consumed in friction and in op erations which will be unnecessary when this invention is practiced.

The invention consists of the apparatus which is precisely defined in the claims. It

. preferred form; Fig. 2, a sectional elevation of parts of this apparatus; and Fig. 3, a side and sectional elevation'of the pump partly illustrated in Fig. 2, the section being on planes indicated by the lines a ac, Fig. 2, and the direction of the view being indicated by arrows 3 3 v This apparatus comprises two centrifugal pumps, a shaft, a shaft-driving drum, suction-pipes and dischargeepipcs. The pumps stand on and are attached to the bed-plate 1, the shells 2 of the pumps being bolted to thebed-plate close to its ends. The pumps are alike in construction except that in stead of each being an exact duplicate of the other, each is composed of parts that are symmetrical to those of the other. Each pump has the single outwardly facing eentral suction-opening 3 (Fig. 2) that ex tends through the removable circular faceplate a of the shell, and in the opposite or inner wall 5 of the shell is the opening 6. The plug 7, having the flange S, tits in this opening and against the hub 9 formed on the shell, and is fastened to the shell by. the tap-bolts 10 passing through the flange into the hub. T his plug is composed of two separable parts which are fastened together by bolts 11 (Fig. 1), each part forming half of the housing of a shaft-bearing. The bearing-brasses 12 have flanges that rest against an internal shoulder of the housing, in which is the ring of packing 13 that fits between the brasses and the gland let, this gland being fastened by tap-bolts 15 to the housing or plug 7. 1n the operation of the apparatus water is forced into the shell nextto this bearing through the pipe 16 and the passage 17 with which the pipe connects and which is formed in the upper part of the housing. The discharge-passage is in the tubular projection 18 formed on and at the base of the shell. The wheel or impeller is composed of the hub 19, blades 20 and side plates 21 and 22, the blades and plate 22 being fast together and on the hub and the plate 21 being fast on the blades and having the central opening 23 that registers with the opening 3 inthe face-plate 4-. The shell is lined at the sides with thin disks 24 that are detachably fastened to the plate 4 and wall The space or passage 25 that surrounds the wheel and communicates with the discharge-passage 18 has the form represented in Figs. 2 and 3.

The bearings described help to support the shaft, 26, which extends through them and from one pump to the other, the ends of the shaft being within the pumps. tapered portions of the shaft next to its ends it snugly in the hubs 19 of the wheels and each wheel is fastened to the shaft by means that includes keys 27 and a nut 28, the keys being contained in grooves formed in the hub and shaft, and the nut being screwed on a stud projecting from the end of the shaft, so that the nut presses firmly against the hub, as shown by Fig. 2. The

shaft 53G has four other bearings thatare mounted on the standards 29 and 30, bolted to the bed-plate 1 as represented in The f Figs. 1 and 2 the standard 29 supptirting two tlt these hearings and their housings 31 and 32, and the standard 30 supporting the other two bearings and their housings 33 and 34. The housings of the bearings 31 and 33 are pillow-blocks which. are alike, their upper sections or caps being shown in. Fig. 1 and a side view both of the cap and the lower section 35 at one of them. being shown in Fig. 2., Each pillow-block rests on a flat bed which comprises the tops of four lugs formed on the standard two of these lugs 36 being shown in Fig. 2 and two others being back of the standard, 29, and the screws 3'? and two other similar screws that pass through these tour lugs and into the pillow-block fasten it to the standard. The caps of these pillow-blocks are fastened to the lower sections by screws 88 as represented in Figs. 1 and 2. The bearing 32 is mounted as shown by Fig. 2 on the part 39 of the standard 29, and the bearing 34 is mounted on a similar part of the standard 30, the housing of these bearings'also be ing alike and composed of lower sections and caps fastened together by screws 40.

The shaft 26 includes three separable sections, one forming; the central portion of the shaft and having the bearings 32 and 34:, and the others forming the terminal portions of the shaft, one of which has the bearing 31 and the bearing that is supported by the adjacent pump, and the other terminal section having the bearing 33 and the hearing that is supported by the pump into which this section extends. On the central section, at its ends are fast collars ll, and on the terminal sections are fast collars 42 and 43 and the three sections are secured together by screws 4-1 that pass through the collars 41 and into the collars 42 and 43. The arrangement of parts is such that the collars 42and 43 are close to the pillowblocks and will coact with them to preventaxial movement of the shaft, except perhaps to a slight extent, in either direction.

The shathdriving drum 4-5 is mounted on and keyed to the central section oi the shaft as appears by Fig. 2 which shows portions of the shaft and hub 46 of the drum in sec tion, and a part'of the key, 47. The drum is made like a split pulley, in two separable parts, and has in its face a series of grooves in which a cable is to work to drive the drum by power transmitted to it-from an engine.

The suction pipes are the main 48, and the branches 4 9 and 50 which connect the main with the suction-openings of the pumps and which are attached to the taceplates 4 and the discharge-pipes are the main 51, and the branches 52 and 53 which connect the dis charge-passages of the pumps with the main 51 and which are attached to the projections 18, as appears by Fig. 1. The pipe 54: (Fig.

suction-main and by which'the collars -12 and do notrprevent t.

:fluid is drawn through the suc Loam/ca l) is also a su'ction-pipe, as it suctionmain 1-8, and it is the 1a er of a steam-engine that operates the pt In the pipe 54 is a valve or cock thi which the exhaust-steam may pass to lead ing to the suction-mainmay be closed, and another passage may be opened throng which the exhauststeam will pass part 56 of the casing; from wh cape through an open port into viously the pumpsainight be e e internal-combustion-engine or motor, but we prefer to operate them by steam-engine. a

i As the face-plates 4; and the a tcent per tions of the pipes 49 and are removable from in front of the wheels or impcl is, and bothbearings of each of the terminal sections of the shaft and the housings of these hearings are removable from their supports and from the shaft while the l t ter is held by the bearings 3:2 and 3% terminal sections of the shaft are d andput into the shell without separat ng the wheel from the the" are keved to ether as desc' J c a:

and terminal sections of the sin. ing drawn outward and thus separated theshells of the pumps when the ills V blocks and plugs 7 have been removed from their su ports and from the shaft; for then the collars will pass over the s pillow-blocks and through the openings in the shells of the pumps;

Means of known construction tion may be employed to connect with the drum of this so .1 the drum, driven by the engine will d the shaft and wheels of the -uinpi r ng and is or pelled from the pumps into the discharge 49 and 50 and into the pum' pipes through which it is fierce place where it is to be at The fluid, rushing from the 0 and 50 into the purnps at to" e ds of the shaft and in opposite directions, so acts on the wheels and shaft that the tendency of one stream to render the shaft subject to the influence of a strong thrusting force, is counterbalanced by the similar tendency-of the other stream, and, therefore, but little of the power is constant-1d in friction such as is commonly caused by the thrust or the shaft in analogous apparatus which is now in use, and in Which the duty oi both of the pumps shown hereiniis imposed on a single pump. Consequently, each of these pumps may be less than halt as large as a single pump that is required to dothe same work, the stress to which the apparatus is to the subjected iswidely distributed so that it is not excessive in any place, the vibration is comparatively slight for the wheels are small and the distance from the base of each pump to the shaft is short, and the peculiar form, and arrangement of the heavy parts, of the apparatus adapt it to be moved with less trouble than is required to move the other apparatus that comprises a single large nnnp. Although the shaft is provided with the collars 42 and 43, arranged to prevent any axial movement of the shaft that is not very slight, yet either of these collars does not press hard against the adjacent pillow-block unless something interferes with the action of-the apparatus. If, for example, a mass of grass, or other substance that would greatly hinder the passage of the fluid, should lodge in the suction-opening of one of the pumps, then the force tending to move the shaft 'endwise in one direction would be stronger than the opposing force and one of the collars would be pressed against the adjacent illow-block, but the collar would act on t 1e block only for a moment should the obstructing substance be dislodged immediately, and unless it should be quickly dislodged the engine would be:

stopped to enable the obstruction to be removed byhand.

The connection with the suction-main of the pipe 54, through which passes the exhaust from the engine, enables the pumps to be utilized as a condenser when they are operated by a steam-engine. Since in each pump a partial Vacuum is created, the exhaust-steam, as Well as the liquid on which the pumps act, rushes toward the pumps, the steam passing through the pipe 54 and into the suction-main where it is instantly condensed by contact with the cold liquid, the water of condensation being carried on through the pumps and discharge-pipes with the other liquid and solid material. Thus the pumps are made to perform the double duty of condensing the steam and disposing of the water of condensation, in addition to the work which they do on the filling material, and this renders it possible to dispense with the ordinary condenser, not only without loss but with the further advantage that much trouble and expense are saved in the operation of the apparatus. While the pumps are being primed and until they are in full operation, also when the engine is stopped, the fluid may be prevented by means of the valve 55 from flowing into that part of the pipe 54 which is between the valve and the engine, and when the engine is started the exhaust-steam may be dis charged for a few moments from the port in the part 56 of the val ve-casing.

it will be understood that the invention can be embodied in various forms of apparatus differing more or less in details of construction from that shown and particularly described herein.

Having thus deselilaal our invention, what we claim as new and desire to secure by Letters Patent, is:

l. The cond.=inatimr with two centrifugal pumps having a couuhon shaft comm-used of a central section and two terminal sections and couplings and driven by power applied to it between the pumps, the pump-shells being attached to a. bed-plate and each sup porting a shaft-lmaring, and each pump ha ving a single outwardly facing central suction-opening and a. detachable face-plate in which the suction-opening is formed, of: suction-pipes comprising a main and two branches connected with the suction-openings of the pumps; discharge-pipes comprising a main and two branches connected with the discharge-openings of the pumps; other shaft-bearings mounted on standards aflixed to the bed-plate between the pumps; and devices on the shaft cooperative with stationary surfaces surrounding it to counteract t e tendency of the suction at either end of the shaft to draw the shaft endwise when the suction of one pump overbalances that .of the other, the coaction of said devices with said surfaces being dependent on conditions that make the suction of one pump temporarily stronger than that of the other.

2. The combination with two centrifugal pumps having a common shaft composed of a central section and two terminal sections and couplings and driven by power applied to it between the pumps, the pump-shells being attached to a bed-plate and each supporting a shaft-bearing, and each pump having a single outwardly-facing central suction-opening, of: four other shaft-bearings mounted on standardsatiixed to the bed plate between the pumps, the central section of the shaft extending through two of the bearings and each of the terminal sections extending through two of the bearings; and shoulders on the shaft cooperative with the housings of two of the hearings to countcract the tendency of the suction at either end of the shaft to draw the shaft cndwise when the suction of one pump overbalances that of the other, this coaction of the shoulders with the housings being dependent on conditions that make the suction of one pump temporarily stronger than that of the other.

3. The combination with two centrifugal pumps having a common shaft composed of, a central section and two terminal sections and couplings and driven by power applied to it between the pumps, the pump-shells being attached to a bedsplato and each supporting a shaft-bearing, and each pump having a single outwardly facing central suction-opening, of four other shaft-bearings mounted on two standards atlixed to the bedplate between the pumps, the central section of the shaft extending through two of the "bearings and each of the terminal sections extending through two of the hearings; and the couplings and housings of two of the bearings constituting means to counteract the tendency of the suction at either end of the shaft to draw theshaft endwise when the operation of a pump is obstructed, this.co-

action of the couplings With the housings memes being dependent on conditions that make the 10 suction of one pump temporarily stronger than that of the other.

DANIEL L. DODGE. I THOMAS F. ARMSTRONG.

Signed in presence of MORRIS F. CRAFT, ELBEBT F. SMITH. 

